Taking a closer look at your Firebase function, I was able to identify two issues: Usage of both await and then keywords in the same function. These two statements do the same thing. Quoting this accepted answer. await is just an internal version of .then() (doing basically the same thing). The reason to choose one … Read more
Maybe, this website is what you’re looking for: https://javiercbk.github.io/json_to_dart/ You simply paste your json (usually the response coming from an API) and it creates a class in dart for that json. so then, you can use it like: MyJsonClass classResponse = MyJsonClass.fromJson(apiResponse); And access its parameters like this: print(classResponse.mon.a) // output: 3 generated code used: … Read more
use stream.it is like a pipe you add value from a side (Sink) and recieve it on the other side (Stream).i will try to explain it: //make a stream controller StreamController<bool> valueController = StreamController(); //this will listen to every new value you add Stream valueOutput = valueController.stream; //you can add new values throw the sink … Read more
I just did it for the date. You can copy the implementation made in C# in dart. DateTime.DateToTicks(…) void main() { final dateTime = DateTime.now(); print(DateTimeUtils.dateToTicks( dateTime.year, dateTime.month, dateTime.day, )); } class DateTimeUtils { static const int TicksPerMillisecond = 10000; static const int TicksPerSecond = TicksPerMillisecond * 1000; static const int TicksPerMinute = TicksPerSecond * … Read more
I hope this code helps you. It can be written in a more beautiful way but I hope you get the idea. //Convert the color to hex, Save it in preferences var myColor = Colors.blue; var hex = ‘#${myColor.value.toRadixString(16)}’; //save Hex value in sharedpreference. //get the hex value from shared preferences and convert it into … Read more
This is declaring a local variable: AnimationController _animationController = AnimationController(vsync: this, duration: Duration(milliseconds: 500)); What you want is assign to your existing class member variable: _animationController = AnimationController(vsync: this, duration: Duration(milliseconds: 500)); solved Dart throws LateInitializationError even when I initialize variables in initState
Hope this helps this code will help to access the data inside the contents from your JSON structure and map it to variables. var jsonDecode = json.decode(jsonFile); //Decode your json file //then map the content details to a variable. var content = jsonDecode[‘content’]; // Since data inside your json eg above is a list. // … Read more
(Answer update: Since v0.18, this sort of pitfall doesn’t exist since the UI and background code run in a shared isolate. The answer below is only relevant for v0.17 and earlier.) audio_service runs your BackgroundAudioTask in a separate isolate. In the README, it is put this way: Note that your UI and background task run … Read more
You need firebase_dynamic_links to implement a referral program, For more information visit official page How Create Dynamic Link? final DynamicLinkParameters parameters = DynamicLinkParameters( uriPrefix: ‘https://abc123.app.goo.gl’, link: Uri.parse(‘https://example.com/’), androidParameters: AndroidParameters( packageName: ‘com.example.android’, minimumVersion: 125, ), iosParameters: IosParameters( bundleId: ‘com.example.ios’, minimumVersion: ‘1.0.1’, appStoreId: ‘123456789’, ), googleAnalyticsParameters: GoogleAnalyticsParameters( campaign: ‘example-promo’, medium: ‘social’, source: ‘orkut’, ), itunesConnectAnalyticsParameters: ItunesConnectAnalyticsParameters( providerToken: … Read more
There has been a new update in dart language named null safety. So with this update, many of the recent packages and libraries which were made before this update, are not still integrated and compatible with this update and they are outdated. you should Wait for the packages that you depend on to migrate. read … Read more
Found the Solution using FutureBuilder class MyApp extends StatefulWidget { @override _MyAppState createState() => _MyAppState(); } class _MyAppState extends State<MyApp> { _load() async { final file = await rootBundle.loadString(‘assets/j.json’); final data = await jsonDecode(file); print(data.toString()); } @override Widget build(BuildContext context) { return FutureBuilder( future: _load(), builder: (_, AsyncSnapshot<dynamic> snapshot) { return !snapshot.hasData ? Container( color: … Read more
Welcome to flutter. In flutter, you can do that very easily using ListView.builder. Just add an item count of 60 and create a list of roll numbers and bool values. Then add any custom widget for example text widget and use the index of itemBuilder and print that index from the list of roll numbers … Read more
You can use the location of the device and store the lat and long of the device in the backend(probably AWS if you are using it!). Every device registers to your app will be sending its realtime lat and long to your backend. You can have some sort of computation or graph-based analysis in the … Read more
In your function list you are calling the functions on list creation. This makes flutter throws this exception (which is correct because Navigator tries to route during the build phase of the other widget). Apart from that, the code is quite weird to me but to get it to work you need to use this … Read more
You are using the wrong list: This: chatDocs[index].documentID, chatDocs[index][‘text’], (chatDocs[index][‘userId’] == futureSnapshot.data.uid) ? true : false, ValueKey(chatDocs[index].documentID)); should reference messages, not chatDocs. Because index is the index into messages. 0 solved Flutter List UI not updating properly